Nipples/breasts? Why so Taboo?

It is a simple question. Why are nipples/breasts so taboo? I want your opinion. Guys with their shirt off it is okay, but a girl, "OMG DON'T LOOK KIDS! NIPPLES!!! YOU SHOULD BE ashamed OF YOURSELF!" Keep in mind a lot of men have bigger breasts than most women!

Also, is this picture not as taboo in your mind because the nipples have been erased? Finally, while we are on it. Why can we have nipples of african tribes on public TV but not other races? Why the divide?

I know these sounds like silly questions, but I want some rational discussion over this topic.

It is completely rational to be offended at the hanging of innocent people. The thought of it nauseates me. However, I don't think that it's rational to be offended by an associated word. Words are just tools for our use; they provide a means to express a specific emotion or convey an idea. If I yell shit instead of fiddlesticks when I stub my toe, bystanders will understand my pain in a different way. People who don't curse may in fact be confining and limiting themselves, which saddens me. Furthermore, "eat shit" means something completely different than "holy shit". Words are tools and context is everything.
If someone says nigger, well, then they're expressing an idea that involves racism because that's what the word means. There is no reason to be offended by the word and its definition, but there may be a reason to be offended by the speaker if that word is being used as a tool to hurt someone. The judgment that we may make about the person who uses the word nigger based on the definition and history of the word.... well.... we usually come to the conclusion that the speaker is a racist fuck. (not a meany... but a racist fuck).
So yes, be offended by the speaker and the context but please realize that no word should be "banned". They're important tools. What you're really looking for is to ban racism... which unfortunately is more difficult than rendering a word taboo.
Sorry soph, this is tots a topic

Blacks call each other that word all the time , so that is proof the word is harmless unless used derogatorily ... but then they get pretty upset if a white person would use the word and cry the 'racist' card. But that's as far as I'll go , let's get back to the nipples , yes?